diff --git a/gns3server/compute/qemu/__init__.py b/gns3server/compute/qemu/__init__.py
index 9e915fb8..a06af774 100644
--- a/gns3server/compute/qemu/__init__.py
+++ b/gns3server/compute/qemu/__init__.py
@@ -226,7 +226,7 @@ class Qemu(BaseManager):
         else:
             try:
                 output = await subprocess_check_output(qemu_path, "-version", "-nographic")
-                match = re.search("version\s+([0-9a-z\-\.]+)", output)
+                match = re.search(r"version\s+([0-9a-z\-\.]+)", output)
                 if match:
                     version = match.group(1)
                     return version
diff --git a/gns3server/compute/vmware/__init__.py b/gns3server/compute/vmware/__init__.py
index 3d836923..4ee12a40 100644
--- a/gns3server/compute/vmware/__init__.py
+++ b/gns3server/compute/vmware/__init__.py
@@ -701,7 +701,7 @@ class VMware(BaseManager):
             path = ctypes.create_unicode_buffer(ctypes.wintypes.MAX_PATH)
             ctypes.windll.shell32.SHGetFolderPathW(None, 5, None, 0, path)
             documents_folder = path.value
-            return ['{}\My Virtual Machines'.format(documents_folder), '{}\Virtual Machines'.format(documents_folder)]
+            return [r'{}\My Virtual Machines'.format(documents_folder), r'{}\Virtual Machines'.format(documents_folder)]
         elif sys.platform.startswith("darwin"):
             return [os.path.expanduser("~/Documents/Virtual Machines.localized")]
         else:
diff --git a/gns3server/utils/__init__.py b/gns3server/utils/__init__.py
index 7aabbcd0..c571582d 100644
--- a/gns3server/utils/__init__.py
+++ b/gns3server/utils/__init__.py
@@ -60,7 +60,7 @@ def parse_version(version):
     """
 
     release_type_found = False
-    version_infos = re.split('(\.|[a-z]+)', version)
+    version_infos = re.split(r'(\.|[a-z]+)', version)
     version = []
     for info in version_infos:
         if info == '.' or len(info) == 0:
diff --git a/gns3server/utils/interfaces.py b/gns3server/utils/interfaces.py
index 0431c5ad..48880ead 100644
--- a/gns3server/utils/interfaces.py
+++ b/gns3server/utils/interfaces.py
@@ -46,7 +46,7 @@ def _get_windows_interfaces_from_registry():
             hkeycard = winreg.OpenKey(hkey, network_card_id)
             guid, _ = winreg.QueryValueEx(hkeycard, "ServiceName")
             netcard, _ = winreg.QueryValueEx(hkeycard, "Description")
-            connection = r"SYSTEM\CurrentControlSet\Control\Network\{4D36E972-E325-11CE-BFC1-08002BE10318}" + "\{}\Connection".format(guid)
+            connection = r"SYSTEM\CurrentControlSet\Control\Network\{4D36E972-E325-11CE-BFC1-08002BE10318}" + r"\{}\Connection".format(guid)
             hkeycon = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, connection)
             name, _ = winreg.QueryValueEx(hkeycon, "Name")
             interface = r"SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{}".format(guid)
@@ -92,7 +92,7 @@ def get_windows_interfaces():
     interfaces = []
     try:
         locator = win32com.client.Dispatch("WbemScripting.SWbemLocator")
-        service = locator.ConnectServer(".", "root\cimv2")
+        service = locator.ConnectServer(".", r"root\cimv2")
         network_configs = service.InstancesOf("Win32_NetworkAdapterConfiguration")
         # more info on Win32_NetworkAdapter: http://msdn.microsoft.com/en-us/library/aa394216%28v=vs.85%29.aspx
         for adapter in service.InstancesOf("Win32_NetworkAdapter"):